Many of the 3rd party websites such as Trulia will respond to requests to remove the pictures after the home is sold. However the information has been spread to thousands of local agents and real estate companies. It is essentially impossible to remove them from the internet.
If there are only a couple websites that you are particularly bothered by contact the listing agent and see if he can get the web post changed.
Average price for Palo Alto homes for sale http://julianalee.com/palo-alto/palo-alto-statistics.htm
Records of Palo Alto real estate just sold http://julianalee.com/palo-alto/palo-alto-home-sales.htm
Top 3 agent for 3 years nationwide at Keller Williams Realty, the nations largest
Over 20 years experience
Over 1,000 homes sold in Santa Clara County and San Mateo County